A 200 NC Charge Is Placed on the X-Axis at X

A 2.00 nC charge is placed on the x-axis at x = -3.00 cm,another 2.00 nC charge is place on the x-axis at x = 3.00 cm,and a third 2.00 nC charge is placed on the y-axis at y = 3.00 cm.What is the potential at the origin?

A) 1800 V
B) 2700 V
C) 3600 V
D) 5400 V
E) 108 V